Coal seam wind and spray linked coal core drilling tools and its method for coal core drilling

Abstract

The invention relates to a machine for drilling coal core with wind and water fog in a coal bed, which includes a pneumatic drill, a drill shank, a drill stem and a drill end joint and is characterized in that: the other end of the drill end joint is connected with the outlet end of a water atomization device, the two inlet ends of the water atomization device are respectively connected with a pressure ventilation pipe and a water supply pipe; the front end of the drill stem is connected with a corer. The operation procedure of the machine is that: arrange holes, connect pipeline, drill the coal core, withdraw the drill and assess if the primitive character of the coal core meet the requirements of integrality, quality and rapidity. The core bit of the machine provided by the invention has good cooling property, the withdrawn coal core is integral and keeps the primitive character, which is especially suitable for the coring for determining the firedamp content of the soft coal bed. The method for drilling the coal core keeps the advantages of the coring with water and wind as media, which not only overcomes the defects of the coring method by removing slag with water as the medium but also overcomes the defects of coring with wind as the medium.

Description

technical field [0001] The invention relates to coal seam wind and water mist linkage drilling coal core equipment and a method for drilling coal cores, and is particularly suitable for coring of soft coal seams. Background technique [0002] Gas is a valuable energy resource, but coal and gas outbursts have always been a major hidden danger to coal mine safety production. Strengthening coal seam gas drainage is the most effective measure to prevent coal mine gas accidents and make full use of energy resources. The premise of coal seam gas drainage and prevention of gas accidents is to fully grasp the law of coal seam gas occurrence and accurately measure the coal seam gas content. The simple, fast and relatively accurate method for measuring coal seam gas content is the direct measurement method of underground coal seam drilling and coring. The most critical part of this method is coring. The quality of coring is directly related to the success of coal seam gas content mea...

AI Technical Summary

Problems solved by technology

However, the biggest weakness of the wind medium coring process is that the air flow does not cool the drill bit sufficiently during the coring process, and the heat generated by friction during the coring process can easily cause the coal core to be burned out and deteriorate, resulting in inaccurate measurement results and even spontaneous combustion of the coal seam , leading to gas disasters

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